The fastest JSON Schema and JSON Type Definition validator for Node.js and browsers.
Ajv is a JSON Schema validator that validates JSON data against predefined schemas to ensure data structure and integrity. It supports multiple JSON Schema drafts and JSON Type Definition, generating highly optimized validation code for maximum performance. It solves the problem of unreliable data by providing rigorous, standards-compliant validation for JavaScript applications.
Developers building Node.js or browser-based applications that require robust validation of JSON data, such as APIs, configuration files, or data processing pipelines.
Developers choose Ajv because it is the fastest JSON validator available, with comprehensive standard support and extensive customization options. Its performance optimization and reliability make it the preferred choice for data-critical applications.
The fastest JSON schema Validator. Supports JSON Schema draft-04/06/07/2019-09/2020-12 and JSON Type Definition (RFC8927)
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Generates optimized validation code that consistently ranks as the fastest in benchmarks, making it ideal for high-throughput applications like API validation.
Validates against multiple JSON Schema drafts and JSON Type Definition (RFC8927), ensuring compliance with industry standards and flexibility.
Supports removing additional properties, assigning defaults, and coercing data types during validation, as highlighted in the README's data modification features.
Allows user-defined keywords, asynchronous validation, and internationalized error messages, enabling tailored validation logic for diverse needs.
Major releases like v8.0.0 introduce breaking changes, requiring migration efforts that can disrupt existing projects, as noted in the changes history.
Configuring features like custom keywords, async validation, or standalone code generation involves more complexity than basic validation, which may slow down onboarding.
The generated validation code, while performance-optimized, can increase bundle size, which might be a concern for frontend applications with strict size limits.